Vantage 4.0 migration

We are going to migrate to vantage 4.0 on labor day weekend. We have
had Vantage 4.0 installed on a test server for about the past six
weeks, and the main changes are obvious. But in an attempt to live past
the first week after the migration, I would like to ask those who
have gone into production with the new version if you would be kind
enough to let me know what surprises you encountered in terms of
your users screaming at you for changes within the various modules.
Also would like to know of positive feedback. We have all modules
except EDI, MRP,and payroll.